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1) I would consider a distillery to be a Class 1 Division 1 location and not a Division 2 location as outlined in NEC Article 501.1 Scope.
The primary hazards in craft distilling are fire and explosion. Fire can occur when vapors from flammable organic compounds such as ethanol are released from leaks in tanks, casks, and equipment such as transfer pumps, pipes, and flexible hoses. Dust from processing grain and combustion from wood floors, casks, and racks can also cause fires or explosions. A vapor explosion can occur if enough vapors are released in an enclosed space with ignition sources present.
2) Standard vapor and explosion proof wiring methods such as threaded Rigid Metal Conduit, conduit seals, sealed fittings and explosion proof boxes would be required.
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